In the original Julian calendar, the year started with January, named after Janus, the Roman god of beginnings. He was two-faced, so he looked back at the old year and forward to the new year.

"Originally, January 1 was the date of the new year in the Julian calendar, but after the fall of the Roman Empire, the date gradually changed in various parts of Europe to March 25, to conform with Christian festival of the Annunciation. England adopted March 25th as New Year's day in the twelfth century."

It changed here in 1752 with the adoption of the Gregorian calendar.

Says here I'm correct and it was originally 10 months

The original Roman calendar is believed to have been a lunar calendar, which may have been based on one of the Greek lunar calendars. As the time between new moons averages 29.5 days, its months were constructed to be either hollow (29 days) or full (30 days).

KING ROMULUS -

The original Roman calendar was said to have been invented by Romulus, the first king of Rome, around 753 BCE. The calendar started the year in March (Martius) and consisted of 10 months, with 6 months of 30 days and 4 months of 31 days. The winter season was not assigned to any month, so the calendar year only lasted 304 days with 61 days unaccounted for in the winter.

Calendar of King Romulus:

Martius - 31 Days Aprilis - 30 Days Maius - 31 Days Iunius - 30 Days Quintilis - 31 Days Sextilis - 30 Days September - 30 Days October - 31 Days November - 30 Days December - 30 Days